skaer



Sept. 16 1924.

A. H. SKAER ET AL REVERS I BLE DRUMS Filed Sent. 12, L922 2 Shelia-Shani. 1

Way

' 'Re. 5,917 A. H. SKAER ET AL R BVERS l BLE DRUMS Original vFiled Sent. 12, i925 2 Sheets-Sheet byatu RM Sept. 16, 1924. I I UNITED STATES PATENT OFFICE.

mm a. m THEODORE E. BARKER, AND OMAR E. CLARK, OF DENVER, CO'LO mo, LSSIGNORB TO THE DENVER ROCK DRILL MANUFACTURING COMPANY, 01

DENVER, COLORADO, A CORPORATION OF DELAWARE.

REVERSIBLE DRUMS.

dated June 12, 1928, Serial No. 587,803, filed September 12, 1922. Application for reissue fled July 28, 1924. Serial 1T0. 728,989.

Orlllfl No. 1,458,554,

Toall whom it may camera: ent drums 22 havin on their adjacent ends Be it known that we, ARTHUR H. SKAER, flanges 23 forming a housing, within which THEODORE E. BARKER, and Oman-E. CLARK, is rotatablv mounted a head 24 carried by citizens of the United States, residip at the I Denver, in the county of Denver and taste their internal annular faces with ratchet of Colorado, have invented certain new and teeth 25, the teeth of one drum being set useful Im rovements in Reversible Dru-ms, reversely to the teeth of the other, as indiof which t e following is a specification. cated by the dotted and full lines in Figure The present invention relatestowinding 2. It will be noted that the active or abutdrum mechanism of the type in which two ment faces of the ratchet teeth 25 are not drumsare employed, driven a common radial to the axis of the drums but are at a prime mover. backward angle (substantially to the The preferred embodiment of the invenradial lines. The head 24 terminates in a tion is illustrated in the accompanying drawings, wherein a double pawl 27 that thus turns on an axis Figure 1 is a longitudinal sectional view parallel to the axes of the shafts and drums. through theimproved structure, Preferably this pawl has an open-sided Figure 2 is a cross sectional view on the socket 28 to receive the pivot 26. The pawl line 2-2 of Figure 1, is rovided with opposite offset teeth 29, Figure 3 is a similar view on eat of which coacts with the opposite of F gure 1. ratchet teeth of the drum flanges.

Figure4isa detail perspective view of the thus be seen that if one of the teeth 29 is pawl, in interlocked abutting relation with one of Figure 5 is a detail perspective view' of the teeth of one of the drums, the other 5 the actuating means for one of the brake tooth 29 will be out of coaction with the oprums.

In the embodiment disclosed, employed having spaced supports 6 and The support 6 carries a motor 8, which may or desired character.

the line 3-3 a base 5 is vice versa.

7. that if the shaft 14 is rotated in one direcsuitable reversible tion one of the drums will be clutched there be of any well known to while the other will be free. Upon a re- Thesupport 7 is proverse rotation" of the shaft the pawl will shaft 14. The flanges are provided on transverse pivot 26, and mounted thereon is It will positely set teeth of the other drum and It will furthermore be apparent vided with a gear casing 9 having aremovautomatically swing so as to' bring the other able cover plate 10. tooth into coaction with the ratchet teeth of Extending between the supptyts'fi and? the other drum while the first mentioned I and operated by the motor 8 is a motor pawl tooth will be released and the drum shaft 11 having an anti-friction bearing 12 is free to rotate.

in the support 6 adjacent to the motor 8 and 'Ph specific construction of the pawl and having an anti-friction bearing 13;'in,;/the pawl mounting and the relation of the teeth cover late 10. This shaft is surrounded with respect thereto are important. It will mlar shaft 14 having roller bearings be noted that the pawl has a relatively free 15 the supports 6 and 7. The shaft 11 swinging movement on the arm and that, as

carrles a pinion 16 meshingwith a gear 17 shown. in Figure 2, when a tooth of the gear case 9 and said pawl is completely seated at the root of one gear I has secured t ereto a inion 18 of the ratchet teeth 25, the limit of the 45 me g with a gear19 that is red with swinging movement of said pawl has not rela on to a pinion 20. The pinion 20 is been reached. The arm 24 and pawl therein mesh with a gear wheel 21 fixed to the fore act as a toggle. Consequently when a tubular shaft 14. It will thus be evident reversal of the direction of rotation of the that the shaft 14 may be driven in either motor takes 1 lace and the pawl shiftsfrom of opposite directions from the motor and the ratchet tooth of one drum and engages at a reduced speed.

Journaled upon the shaft 14 are independaction causes a positive wedging action to with a tooth of the other drum. this toggle take place and the aforesaid inclination of the teeth insures the pawl tooth to completely enter the interdental space and thus secures a complete bearing between the pawl and ratchet tooth. The possibility of a clutching action taking place and being maintained at the ends of the teeth is thus minimized and the toggle or wedging action maintains the complete engagement as long-as the parts are in driving connection. Moreover this complete engagement will always take place irrespective of wear or discrepancies in the formation of diffcient teeth.

It is furthermore to be noted by reference to Figure 2 that the teeth 29 of the pawl 27 are so related to the ratchet teeth 25 that when the change takes place the pawl tooth 29 moving into action is engaged with its ratchet tooth before the other pawl tooth 29 is disengaged from the inclined face of the other ratchet tooth. Consequently a positive change is obtained. Furthermore by reason of the pivotal mounting, as shown, the pivot 26 is behind and in line with the active pawl tooth 29, forming an abutment behind the tooth and in direct line with the pressure exerted on said tooth. This materially lessens the chance of breakage.

In order to control. the movement of the drum when free the flanges 23 preferably constitute braking surfaces and brake bands 30 are arranged thereupon. Preferably these brake bands are each connected at one end, as shown at 31, with a rod 32 pivotally mounted, as shown at 33, on the base, while the other end is fastened as illustratedat 34 to a sleeve 35 slidable upon the rod. A nut 36 adjustably threaded on the free end of the rod 32 bears upon the sleeve and is provided with a handle knob 37. By turning this nut the brake band can be tightened or loosened as desired.

From the foregoing, it is thought'that the construction, operation and many advantages of the herein described invention will be apparent to those skilled in the art, without further description, and it will be understood that various changes in the size, shape, proportion and minor details of construction may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

What we claim, is: v

1. The combination with a pair of oppositely rotatable driven members having internal inset oppositely disposed ratchet teeth, of a driving member common to the driven members and rotatable in opposite directions, and a pawl member rotatable with the driving member'and pivoted thereon on an axis substantially parallel to the axis of rotation of the driving member, said pawl member having oppositely disposed teeth that respectively engage the internal ratchet teeth of the driven members accordingly as the driving member is rotated in one direction or the other, and said pawl member having a pivotal movement beyond the limits defined by the ratchet teeth to secure atoggle or wedging action.

2. The combination with a' air of oppositely rotatable driven mem rs having internal inset oppositely disposed ratchet teeth provided with abutment faces that are backwardly inclined to lines radial to the driven members, of a driving member common to the driven members, and rotatable in opposite directions, and a pawl mombcr rotatable with the driving member and pivoted thereon on an axis substantially parallel to the axis of rotation of the driving member. said pawl member havingioppositcly disposed teeth that respectively engage the internal teeth of the driven members accordingly as the driving member is rotated in one direction or the other.

3. The combination with a' pair of oppositely rotatable driven members having internal inset oppositely disposed ratchct teeth provided with abutment faces that are backwardly inclined to lines radial to the driven members, of a driving member common to the driven members and rotatable in opposite directions, and a pawl member rotatable with the driving member and pivoted thereon on an axis substantiallyparallel to the axis of rotation of the'driving member. said pawl member having oppositelv disposed teeth that respectively en-' gage the internal teeth of the driven members accordingly as the driving member is rotated in one direction orthe other, and said pawl member having a pivotal movement beyond the limits defined by the ratchet teeth to secure a toggle or wedging action.

4. The combination with a pair of oppositely rotatable driven members havin oppositely disposed ratchet teeth provided with abutment faces that are backwardly inclined to lines radial to the driven members, of a driving member common to the driven members and rotatable in opposite directions, and a pawl member rotatable with the driving member and pivoted thereon on an axis substantially parallel to the axis of rotation of the driving member, said pawl member having oppositely disposed teeth that respectively engage the said abutment faces of the ratchet teeth of the driven members accordingly as the driving member is rotated in one direction or the other.

5. The combination with a pair of oppositely rotatable driven members, of a driving member common thereto and rotatable in opposite directions, an arm rotatable with the driving member and having a pivot formed on its free end, and a clutch member having a socket between its ends in which the pivot is engaged, said-clutch I rotatable in ber havin mternal oppositely.

" inset oppositely -member havin portions on opposite sides. of

the socket an substantial] in line therewith and with the pivot, t at respectively engage the driven membersto operate one or the other accor her is turned in one irection or the other.

6. The combination with a 'air of opitely rotatable driven mem rs having disposed ratchet teeth, of a driving member common thereto and o posits directions, an arm rotlib dri member and havin end, and a aw member having a socket between its on s in which the pivot is engaged, said clutch memteeth on opposite sides of the socket an substantial y in line therewith and with the pivot that respectively engage the ratchet teeth of the-members to operate one or the other accordingly as the dnvmg member other. Y

7. The combination with a reversibly rotatable drivin shaft, of alined separate drums rotatab e thereabout and having adjacent flanged ends provided with internal disposed ratchet teeth, a between the anges thereof,

tatable with a pivot formed on its head on the aft extending drums within the adjacent and a double pawl pivoted between its ends on the free end of the head parallel to the axis of the shaft and having oppositely disposed teeth that respectively engage the o ite ratchet teeth of the drums accor mgly as the shaft is driven in opposite d1- rections.

8. The combination with a reversibly rotatable driving shaft, of rotatable drums lo cated end to end and rotatable about the driving shaft, said 'drums'being provided on their adjacent ends with ratchet teeth, the t'eglth of one druin hazing agutrielnt faces 'sposed p 'teytot etee ote other drum and mkwardl' inclined at an angle to the radial lines o the drums, and a double pawl having a pivotalmounting on the shaft between the drums, the pivot axis of said pawl being substantially arallel to the axis of the driving sha said pawl having oppositely extend teeththat respectively engage the inclin faces of ly as the driving mem- 'clmed faces of the ratchet tee is turned in one direction or the being capable of V g l the ratchet teeth of the drums accordingly as the other.

9. The combination with a reversibly ro tatable driving-shaft, of rotatable drums located end to end and rotatable about the drivin shaft, said drums being provided on the1r adjacent ends with ratchet teeth, the teeth of one drum having abutment faces disposed op ositely to the teeth of the other drum and ackwardly inclined at an angle to the radial lines of the drums,.an arm carried by the shaft and located between the drums and a double pawl having a pivotal mount ng on the free end of the arm, the pivot axis of aid pawl being substantially shaft, sai wl having oppositely extendin teeth t at respectively enga the inof the drums accordingly as the shaft is rotated in one direction or the other, and said pawl ivotal movement beyond the limits defined y the final en agement of the awl teeth with the bases of the ratchet teet 10. The combination with a driving shaft, of rotatable drums journaled on the shaft and locatedend to end, the adjacent ends of said drums having flanges provided with internal oppositely disposed ratchet teeth that have 'backwardly inclined abutment faces, an arm mounted on the shaft between the drums and having a terminal pivot substantially arallel to the shaft, and a double pawl ends that receives the pivot, said pawl having oppositely extending teeth in line with the pivot and respectively engaging the ratchet teeth of the drum flanges, accordingly as the shaft is rotated in one directionor the other, the said pawl teeth being so related to the ratchet teeth that on the pivotal movement of the pawl, the tooth thereof moving into action is 'en- OMAR E. CLARK. THEODORE E. BARKER.

arallel to the. axis of the driving aving a socket between its shaft isrotated in one direction or the 'gaged with a ratchet tooth before the other 

